A study of C3HD in cold interstellar clouds

M B Bell; L W Avery; H E Matthews; P A Feldman; J K Watson; S C Madden; W M Irvine

doi:10.1086/166150

A study of C3HD in cold interstellar clouds

Astrophys J. 1988 Mar 15;326(2):924-30. doi: 10.1086/166150.

Authors

M B Bell¹, L W Avery, H E Matthews, P A Feldman, J K Watson, S C Madden, W M Irvine

Collaborator

W M Irvine²

Affiliations

¹ Herzberg Institute of Astrophysics, National Research Council of Canada.
² U MA, Amherst, FCRAO

PMID: 11538339
DOI: 10.1086/166150

Abstract

We have detected the 1(10)-1(01) transition of C3HD at 19.418 GHz at twelve positions in cold, dark clouds and resolved the D hyperfine components in two sources (L1498 and TMC-1C) well enough to derive values for the D quadrupole coupling constants. Simultaneous observations of C3H2 in each source yield relative integrated line intensities in the range 0.10-0.18, from which we derive relative [C3HD]/[C3H2] abundances in the range 0.05-0.15. These are among the highest deuteration ratios yet observed. Within the limits of the observational and modeling uncertainties it is possible to explain the derived [C3HD]/[C3H2] ratios by ion-molecule chemistry if [e-] approximately 3 x 10(-7).

Publication types

Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Astronomical Phenomena
Astronomy*
Deuterium / analysis*
Deuterium / chemistry*
Extraterrestrial Environment*
Hydrocarbons / analysis*
Models, Theoretical
Spectrum Analysis

Substances

Hydrocarbons
Deuterium